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EMS, Berlin, September 2011

Retrieval of atmospheric CO 2 from satellite near-infrared nadir spectra in the frame of ESA’s climate change initiative M.Reuter , O.Schneising , M.Buchwitz , J.Heymann, H.Bovensmann, J.P.Burrows Institute of Environmental Physics, University of Bremen, Germany. EMS, Berlin, September 2011.

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EMS, Berlin, September 2011

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  1. Retrieval of atmospheric CO2 from satellite near-infrarednadir spectra in the frame of ESA’s climate change initiativeM.Reuter , O.Schneising , M.Buchwitz , J.Heymann, H.Bovensmann, J.P.BurrowsInstitute of Environmental Physics, University of Bremen, Germany EMS, Berlin, September 2011

  2. ESA’s GHG-CCI: Aims and Motivation

  3. ESA’s GHG-CCI: Road Map

  4. Two in-house algorithms

  5. BESD XCO2

  6. Park Falls, USA Bremen, Germany Darwin, Australia 350km 350km 350km Lauder, New Zealand 350km Validation with TCCON FTS measurements • Restriction to a limited validation data set due to computational costs • Only 4 TCCON sites measured in the full period 2006-2010

  7. Comparison with FTS, CarbonTracker, GOSAT Overall good agreement betweenSCIAMACHY, GOSAT, FTSand CarbonTracker No statistical significantregional biases Single measurementprecision ~2.5ppm

  8. Comparison with FTS, CarbonTracker, GOSAT Smoothed Results show:Good agreement of year-to-year increase and seasonal amplitude.(Data density allows smoothing only at Park Falls and Darwin)

  9. WFMD XCO2

  10. Global increase • Computational costs are orders of magnitude lower • Processing of global data easily possible • A global dataset 2003-2009 is available • Similar annual global patterns • Continuous year-to-year increase of global XCO2

  11. CO2 uptake by growing vegetation Mean wind direction Fnet Assumption: XCO2 gradient in wind directionapproximately proportionalto net surface flux Fnet XCO2 West East Longitude

  12. CO2 uptake by growing vegetation Calculation of gradients aboveboreal forests (Canada+Russia): Good agreement with CarbonTracker (year-to-year progression and size) Canada: larger neg. gradientssuggest stronger CO2 uptake Russia: less strong gradientssuggest weaker CO2 uptake

  13. http://www.esa-ghg-cci.org/ Intercomparison with other XCO2 algorithms • Within the GHG CCI several different XCO2 retrieval techniques are involved: BESD, WFMD, and the algorithms of SRON, University of Leicester, ACOS, and NIES • First inter-comparisons with FTS measurements show many similarities but also differences which have to be analyzed

  14. http://www.esa-ghg-cci.org/ THANKS!

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